Document and Entity Information (USD $)	12 Months Ended
	Mar. 31, 2013	May 23, 2013
Document and Entity Information
Entity Registrant Name	ACXIOM CORP
Entity Central Index Key	0000733269
Document Type	10-K
Document Period End Date	Mar. 31, 2013
Amendment Flag	false
Current Fiscal Year End Date	--03-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float	$ 898,724,507
Entity Common Stock, Shares Outstanding		73,913,373
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	FY